netdev - [net-next 08/15] ixgbe: check Core Clock Disable bit

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Date:	Thu, 20 Mar 2014 01:32:58 -0700
From:	Jeff Kirsher <jeffrey.t.kirsher@...el.com>
To:	davem@...emloft.net
Cc:	Jacob Keller <jacob.e.keller@...el.com>, netdev@...r.kernel.org,
	gospo@...hat.com, sassmann@...hat.com,
	Arun Sharma <asharma@...com>,
	Jeff Kirsher <jeffrey.t.kirsher@...el.com>
Subject: [net-next 08/15] ixgbe: check Core Clock Disable bit

From: Jacob Keller <jacob.e.keller@...el.com>

This patch corrects the stop_mac_link_on_d3 function in ixgbe_82599 by
checking the Core Clock Disable bit before stopping link.

CC: Arun Sharma <asharma@...com>
Reported-by: Chris Pavlas <chris.pavlas@...el.com>
Signed-off-by: Jacob Keller <jacob.e.keller@...el.com>
Signed-off-by: Jeff Kirsher <jeffrey.t.kirsher@...el.com>
---
 drivers/net/ethernet/intel/ixgbe/ixgbe_82599.c | 6 +++++-
 drivers/net/ethernet/intel/ixgbe/ixgbe_type.h  | 3 +++
 2 files changed, 8 insertions(+), 1 deletion(-)

diff --git a/drivers/net/ethernet/intel/ixgbe/ixgbe_82599.c b/drivers/net/ethernet/intel/ixgbe/ixgbe_82599.c
index 572cce4..fcba1d9 100644
--- a/drivers/net/ethernet/intel/ixgbe/ixgbe_82599.c
+++ b/drivers/net/ethernet/intel/ixgbe/ixgbe_82599.c
@@ -518,8 +518,12 @@ out:
 static void ixgbe_stop_mac_link_on_d3_82599(struct ixgbe_hw *hw)
 {
 	u32 autoc2_reg;
+	u16 ee_ctrl_2 = 0;
 
-	if (!hw->mng_fw_enabled && !hw->wol_enabled) {
+	hw->eeprom.ops.read(hw, IXGBE_EEPROM_CTRL_2, &ee_ctrl_2);
+
+	if (!hw->mng_fw_enabled && !hw->wol_enabled &&
+	    ee_ctrl_2 & IXGBE_EEPROM_CCD_BIT) {
 		autoc2_reg = IXGBE_READ_REG(hw, IXGBE_AUTOC2);
 		autoc2_reg |= IXGBE_AUTOC2_LINK_DISABLE_ON_D3_MASK;
 		IXGBE_WRITE_REG(hw, IXGBE_AUTOC2, autoc2_reg);
diff --git a/drivers/net/ethernet/intel/ixgbe/ixgbe_type.h b/drivers/net/ethernet/intel/ixgbe/ixgbe_type.h
index 69271bc..5b0c730 100644
--- a/drivers/net/ethernet/intel/ixgbe/ixgbe_type.h
+++ b/drivers/net/ethernet/intel/ixgbe/ixgbe_type.h
@@ -1793,6 +1793,9 @@ enum {
 #define IXGBE_EEPROM_RD_BUFFER_MAX_COUNT 512 /* EEPROM words # read in burst */
 #define IXGBE_EEPROM_WR_BUFFER_MAX_COUNT 256 /* EEPROM words # wr in burst */
 
+#define IXGBE_EEPROM_CTRL_2	1 /* EEPROM CTRL word 2 */
+#define IXGBE_EEPROM_CCD_BIT	2 /* EEPROM Core Clock Disable bit */
+
 #ifndef IXGBE_EEPROM_GRANT_ATTEMPTS
 #define IXGBE_EEPROM_GRANT_ATTEMPTS 1000 /* EEPROM # attempts to gain grant */
 #endif
-- 
1.8.3.1

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